Majority of horses that are classed as being 17 hands, if correctly measured with a proper measuring stick, are hardly 16 hands and, a 16 hand horse is a big horse.
Another factor to be taken into consideration is that more horses that are over 16.2 are more likely to get leg and wind problems.
I have had many horses that people would say were 17 h. Bit were no bigger than 16.1.
As for me, I will ride anything from 13.2 +. I have been known to get on tiny ponies that were being mean to their little riders. I am 5'9"
Big horses can be harder to hold together correctly. Often a well built 15.2 will take more leg (of the rider) than a narrow 16.2.
It is never good to be height fixated!
William Fox Pitt is 6'5" yet he rides in top events 16.2 horse and does not look wrong on them.